first you need to get the ruby and to do that get the national dex after beating the elite 4 and solve the lostelle crisis which is saving the little girl in berry forest and bringing her back to her dad he will give you a meteorite bring that to the guy near the big machine at the one island Pokemon center next go to mt ember and find the ruby in there, you need strength, after that bring the ruby to the guy mentioned above and he will then ask you to get the sapphire he will give you the rainbow pass which lets you go to islands 4-7 now you asked about island 8 there is no island 8 however there are other islands to get to those you need the aurora ticket and mystic ticket but those are not being given out anymore by Nintendo so sorry.
There is no 8island on fire red sorry.
go to a Pokemon event
When you defeat the gym on Cinnabar Island you will meet Bill outside. He will ferry you to Island One to meet Celio. Bill will then give you a Meteorite and the Tri-pass which will give you access to Island One, Two and Three.How_do_you_unlock_islands_after_beating_the_elite_four
You don't. It only goes up to seven, I think.
Seven island is a place where you can train your strongest Pokemon you can only access it by showing the sailor who took you to the SS Anne the rainbow pass.
With the Rainbow Pass.
Island 8 and Ho-Oh were only accessible through the Pass that was given away quite a long time ago. So basically you can't get to Ho-Oh unless you have that pass.
The official name of island 4 on Pokemon FireRed is Floe Island. To access Floe Island you need the Tri-Pass from Bill. To obtain the Tri-Pass you need to have defeated the Gym Leader of Cinnabar Island.
It is on island 8 (navel island).
Deoxys
I don't think there is even an 8 or 9 island.
you have to fight elite4.
8 Island does not exist. Only the sevii islands. There are seven islands in leafgreen and firered. Four of them can only be visited after finishing the game.
Larvitar is in Seavault Canyon, which is on Seven Island. (Need rainbow pass to get to Seven Island).
you need a tri-pass. And you board the seagaltop ferry and you pick two island
on island 1, in the pokecenter. u can get to island 1 by acheiving the rainbow pass
doesn,t exist